Dr Valmer, who pretends to be the best dentist in town, breaks an arm in a hunting accident and has to find someone to replace him.

Dr Valmer, who pretends to be the best dentist in town, breaks an arm in a hunting accident and has to stop working for several months. He must urgently find someone to replace him. There are not so many candidates. However one of his colleague finds him the "gem". But this supposedly ideal candidate does not look too good : efficient but without charm nor charisma. Back home after three long weeks at the hospital, Daniel is ill at ease with his idle situation. And he starts getting on the nerves of his mates.

Especially when he realizes that his replacement has turned to be charming, funny, with a good sense of humor and has thus seduced everybody around him, even Daniel's own dog ! The dentist business is flourishing. Little by little Daniel starts to hate him, fearing his stand-in will even replace him with his wife.